Alliance Shock Revisited: What 1968-69 Means for 2025

E-International Relations  |  Ju Hyung Kim

Japan and South Korea face a critical strategic juncture as transactional United States foreign policy under a second Trump administration forces both nations to reassess their reliance on American security guarantees. This contemporary "alliance shock" mirrors the late 1960s, when the Guam Doctrine and the North Korean Blue House raid compelled Tokyo and Seoul to seek greater self-reliance.

Historically, this initial rupture catalyzed South Korea's heavy industrialization, utilizing Japanese capital from the 1965 normalization treaty to build the Pohang steel mill, which became the foundation of its modern defense manufacturing. Today, the threat environment has intensified into a complex dual contingency involving a nuclear-armed North Korea, Chinese assertiveness in the Taiwan Strait, and deepening Moscow-Pyongyang military cooperation. To mitigate these overlapping crises, the allies seek to transcend the institutional frameworks of the 2023 Camp David summit by establishing joint defense production, shared stockpiles, and a clear operational division of labor.

Comment

The institutionalisation of trilateral security co-operation following the 2023 Camp David summit reveals a structural transition away from the traditional US-led hub-and-spoke model in Northeast Asia. This shift indicates that Washington is increasingly distributing operational burdens to Tokyo and Seoul to manage simultaneous contingencies in the Taiwan Strait and the Korean Peninsula. However, the persistence of historical grievances between Japan and South Korea continues to limit deep bilateral integration, leaving the trilateral framework vulnerable to domestic political shifts in all three capitals. Consequently, the durability of this security alignment depends less on American extended deterrence commitments and more on the institutionalisation of independent, bilateral crisis-management mechanisms between Tokyo and Seoul.

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